```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>内容分发网络(CDN)技术解析</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/font-awesome/6.4.0/css/all.min.css">
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    <script src="https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js"></script>
    <style>
        body {
            font-family: 'Noto Sans SC', Tahoma, Arial, Roboto, "Droid Sans", "Helvetica Neue", "Droid Sans Fallback", "Hiragino Sans GB", Simsun, sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: #667eea;
        }
        .first-letter {
            font-size: 3.5rem;
            line-height: 1;
            float: left;
            margin-right: 0.5rem;
            font-weight: bold;
            color: #667eea;
        }
        .mermaid {
            background: white;
            padding: 2rem;
            border-radius: 0.5rem;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
    </style>
</head>
<body class="bg-gray-50">
    <!-- Hero Section -->
    <section class="hero text-white py-20 px-4">
        <div class="container mx-auto max-w-6xl">
            <div class="flex flex-col md:flex-row items-center">
                <div class="md:w-1/2 mb-10 md:mb-0">
                    <h1 class="text-4xl md:text-5xl font-bold mb-4 leading-tight">内容分发网络(CDN)技术解析</h1>
                    <p class="text-xl mb-6 opacity-90">加速全球互联网内容交付的分布式网络架构</p>
                    <div class="flex space-x-4">
                        <a href="#intro" class="bg-white text-indigo-700 px-6 py-3 rounded-full font-medium hover:bg-indigo-100 transition duration-300">
                            了解详情 <i class="fas fa-arrow-down ml-2"></i>
                        </a>
                        <a href="#mermaid" class="border-2 border-white text-white px-6 py-3 rounded-full font-medium hover:bg-white hover:text-indigo-700 transition duration-300">
                            查看图表 <i class="fas fa-project-diagram ml-2"></i>
                        </a>
                    </div>
                </div>
                <div class="md:w-1/2">
                    <img src="https://cdn.pixabay.com/photo/2020/06/22/15/56/global-5329713_1280.png" alt="Global Network" class="rounded-lg shadow-xl w-full">
                </div>
            </div>
        </div>
    </section>

    <!-- Introduction Section -->
    <section id="intro" class="py-16 px-4 bg-white">
        <div class="container mx-auto max-w-6xl">
            <div class="text-center mb-16">
                <h2 class="text-3xl font-bold text-gray-800 mb-4">CDN 核心概念</h2>
                <div class="w-20 h-1 bg-indigo-600 mx-auto"></div>
            </div>
            
            <p class="text-lg text-gray-700 mb-8">
                <span class="first-letter">C</span>DN（Content Delivery Network，内容分发网络）是一个分布式的网络架构，旨在提高内容的交付速度和可靠性，改善用户的访问体验。它通过将内容分发到离用户更近的节点（称为边缘节点或缓存服务器），减少延迟和提高传输效率。通过分布式的边缘节点来缓存和优化内容的交付。它不仅提高了内容传输的速度和可靠性，还增强了系统的安全性和抗攻击能力。
            </p>
            
            <div class="grid md:grid-cols-2 gap-8 mb-16">
                <div class="bg-gray-50 p-6 rounded-xl border border-gray-100 card-hover">
                    <i class="fas fa-bolt feature-icon"></i>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">性能优势</h3>
                    <p class="text-gray-600">CDN通过全球分布的节点网络，将内容缓存到离用户更近的位置，显著降低延迟，提高加载速度，使网页、视频等内容能够快速呈现给用户。</p>
                </div>
                <div class="bg-gray-50 p-6 rounded-xl border border-gray-100 card-hover">
                    <i class="fas fa-shield-alt feature-icon"></i>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">安全防护</h3>
                    <p class="text-gray-600">CDN提供DDoS防护、Web应用防火墙等安全功能，通过分散流量和过滤恶意请求来保护源服务器，确保业务连续性和数据安全。</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Features Section -->
    <section class="py-16 px-4 bg-gray-50">
        <div class="container mx-auto max-w-6xl">
            <div class="text-center mb-16">
                <h2 class="text-3xl font-bold text-gray-800 mb-4">CDN 的基本功能和特性</h2>
                <div class="w-20 h-1 bg-indigo-600 mx-auto"></div>
            </div>
            
            <div class="grid md:grid-cols-3 gap-8 mb-16">
                <div class="bg-white p-6 rounded-xl shadow-sm card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-database text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">内容分发</h3>
                    <ul class="text-gray-600 space-y-2">
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>缓存静态和动态内容</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>负载均衡减轻源服务器压力</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>就近节点快速响应</span>
                        </li>
                    </ul>
                </div>
                
                <div class="bg-white p-6 rounded-xl shadow-sm card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-tachometer-alt text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">性能优化</h3>
                    <ul class="text-gray-600 space-y-2">
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>显著降低网络延迟</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>优化传输协议提升速度</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>智能压缩减少带宽</span>
                        </li>
                    </ul>
                </div>
                
                <div class="bg-white p-6 rounded-xl shadow-sm card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-globe text-3xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-gray-800">全球覆盖</h3>
                    <ul class="text-gray-600 space-y-2">
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>分布式节点全球部署</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>智能路由选择最优节点</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check text-green-500 mt-1 mr-2"></i>
                            <span>确保全球用户一致体验</span>
                        </li>
                    </ul>
                </div>
            </div>
        </div>
    </section>

    <!-- Workflow Section -->
    <section id="mermaid" class="py-16 px-4 bg-white">
        <div class="container mx-auto max-w-6xl">
            <div class="text-center mb-16">
                <h2 class="text-3xl font-bold text-gray-800 mb-4">CDN 工作原理图解</h2>
                <div class="w-20 h-1 bg-indigo-600 mx-auto"></div>
            </div>
            
            <div class="mermaid">
                graph TD
                    A[用户请求内容] --> B{CDN边缘节点}
                    B -->|内容已缓存| C[直接从边缘节点返回内容]
                    B -->|内容未缓存| D[向源服务器请求内容]
                    D --> E[源服务器返回内容]
                    E --> F[边缘节点缓存内容]
                    F --> C
                    style A fill:#667eea,color:white
                    style B fill:#764ba2,color:white
                    style C fill:#48bb78,color:white
                    style D fill:#ed8936,color:white
                    style E fill:#4299e1,color:white
                    style F fill:#9f7aea,color:white
            </div>
            
            <div class="mt-8 grid md:grid-cols-2 gap-8">
                <div class="bg-gray-50 p-6 rounded-lg">
                    <h3 class="text-xl font-bold mb-4 text-gray-800">缓存更新机制</h3>
                    <p class="text-gray-600">CDN通过TTL(Time To Live)设置控制缓存有效期，过期后自动向源服务器重新获取最新内容。同时支持手动刷新缓存，确保内容实时更新。</p>
                </div>
                <div class="bg-gray-50 p-6 rounded-lg">
                    <h3 class="text-xl font-bold mb-4 text-gray-800">智能路由选择</h3>
                    <p class="text-gray-600">基于用户地理位置、网络状况、节点负载等因素，CDN智能选择最优边缘节点响应请求，提供最快的访问速度和最稳定的连接。</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Use Cases Section -->
    <section class="py-16 px-4 bg-indigo-50">
        <div class="container mx-auto max-w-6xl">
            <div class="text-center mb-16">
                <h2 class="text-3xl font-bold text-gray-800 mb-4">CDN 应用场景</h2>
                <div class="w-20 h-1 bg-indigo-600 mx-auto"></div>
            </div>
            
            <div class="grid md:grid-cols-2 lg:grid-cols-4 gap-6">
                <div class="bg-white p-6 rounded-xl shadow-sm text-center card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-laptop-code text-3xl"></i>
                    </div>
                    <h3 class="text-lg font-bold mb-2">网站加速</h3>
                    <p class="text-gray-600 text-sm">提高全球访问速度，优化用户体验</p>
                </div>
                
                <div class="bg-white p-6 rounded-xl shadow-sm text-center card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-video text-3xl"></i>
                    </div>
                    <h3 class="text-lg font-bold mb-2">视频流媒体</h3>
                    <p class="text-gray-600 text-sm">减少缓冲，提供高清流畅播放</p>
                </div>
                
                <div class="bg-white p-6 rounded-xl shadow-sm text-center card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-download text-3xl"></i>
                    </div>
                    <h3 class="text-lg font-bold mb-2">软件分发</h3>
                    <p class="text-gray-600 text-sm">加速大型文件下载分发</p>
                </div>
                
                <div class="bg-white p-6 rounded-xl shadow-sm text-center card-hover">
                    <div class="text-indigo-600 mb-4">
                        <i class="fas fa-shopping-cart text-3xl"></i>
                    </div>
                    <h3 class="text-lg font-bold mb-2">电子商务</h3>
                    <p class="text-gray-600 text-sm">提升页面加载速度，提高转化率</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Footer -->
    <footer class="bg-gray-900 text-white py-10 px-4">
        <div class="container mx-auto max-w-6xl">
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                    <h3 class="text-xl font-bold">技术小馆</h3>
                    <p class="text-gray-400 mt-1">探索前沿技术，分享专业见解</p>
                </div>
                <div>
                    <a href="http://www.yuque.com/jtostring" class="text-gray-300 hover:text-white transition duration-300">
                        <i class="fas fa-external-link-alt mr-2"></i> www.yuque.com/jtostring
                    </a>
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            <div class="border-t border-gray-800 mt-8 pt-8 text-center text-gray-400 text-sm">
                &copy; 2023 技术小馆. 保留所有权利.
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```